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3 SheetsSheet 1.

(No Model.)

J. D. EMAOK.

MUFFLER FORSLATES AND SLATE FRAMES.

Patented May 20, 1884.

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(No Model.) 3 Sheets-Sheet2.

J. D. EMAGK.

MUFFLER FOR SLATES AND SLATE FRAMES.

No. 298,740. Patented May 20, 1884.

Fig. 6.

(No Model.) 3 Sheets-Sheet 3.

J. D. EMACK MUFFLER FOR SLATES AND SLATE FRAMES. No. 298,740. PatentedMay 20, 1884.

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ATTORNEY N. PETERS. Phclo-mhugmphnn Washinmm. D. c. 7

lin'iTnn fiTaTns PATENT JOHN D. EMAOK, OF BALDWIN, NEW YORK.

SPECIFICATION forming part of Letters Patent No. 298,740, dated May 20,1884.

Application filed April 14, 1884.

To all whom it may concern:

Be it known that I, JOHN D. EMAOK, of Baldwin, Queens county, New York,have invented a new and useful Muffling Attachment Applicable toSchool-Slates, and also to School-Slate Frames; and I do hereby declarethat the following is a full, clear, and correct description of thesame, reference being had to the accompanying drawings, making part ofthis specification, and to the letters of reference marked thereon, inwhich Figure 1 is aperspective view of the springwire frame. Fig. 2 is across-section of the same covered with the mufiling material. Fig. 3 isa plan view of one end of a slate, showing the nick in same in which theloops of the spring-wire frame are secured, the muffling material beingpartially removed. Fig. 4: is a cross-section of a slate inclosed in aWooden frame, over which the muffler has been sprung. Fig. 5 is aperspective view of the metal clamp employed in connection with themuffier. Fig. 6 is a plan of aslate in closed in a wooden frame, towhich the muf fler has been applied. Fig. 7 is a cross-section of aslate to which the muffler has been applied. Fig. 8 is a plan view of aslate nicked to receive the ends of the muffler.

In the drawings, like parts of the invention are designated by the sameletters of reference.

The nature of the present invention relates to the construction of animproved mufliing device formed from spring-wire, over which isstretched a fibrous or textile material, and which it is intended shallbe sprung over a slate or slate-frame and properly held in position uponthe same either by means of a metal clamp or binder or otherwise, the objeet of the invention being by the use of the muffling device to renderthe slate or slateframe to which it has been applied noiseless whenturned over upon the desk or support upon which it is placed.

To enable those skilled in the arts to make (N0 model.)

and use my invention, I will describe the same.

' A shows a frame composed of spring-wire of the proper size to besprung over the slate B or slate-frame O, and formed so that one end ofthe wire shall form a loop, a, while its opposite end shall be providedwith a loop, I),

formed by soldering the ends together, the

spring-wire in the formation of the frame being bent so that twothicknesses of wire parallel with each other shall form the frame, withsufficient space between them to receive the slate B or slate-frame 0.Over the framework A so formed the muffler, composed of fibrous ortextile material D, is stretched. WVhen applied to a slate, B, one endof the slate is nicked, as at 0, over which the loops at and b of thespring-metal frame are passed and held in position by the elasticity ofthe wire of which the frame-work Ais formed, and a half-round clamp, E,formed of sheet metal and placed over the ends or loops of the framework A and the slate B. When used in connection with a slate-frame, G,the sides of the frame are slightly beveled, the frame is nicked, as inthe case of the slate B, and the mode of applying the muffling deviceand retaining the same in position is precisely the same in the case ofthe slate B.

The muffling device can be afforded at a low cost, is easily applied toslates or slate- ELS frames, and will answer the purpose for which 0 Inpresence of WILLIAM V. H. HICKS, A. SIDNEY DOANE.

